[kmail2] [Bug 363009] New: Outlook generated S/MIME email body (Content-Disposition: attachment; filename="smime.p7m") not readable

[Dennis Schridde via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=363009

            Bug ID: 363009
           Summary: Outlook generated S/MIME email body
                    (Content-Disposition: attachment;
                    filename="smime.p7m") not readable
           Product: kmail2
           Version: 4.14.10
          Platform: Debian testing
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: dennis.schridde at uni-heidelberg.de

I received an email from what appears to be Outlook, which declares the body as
being in following form:
```
Content-Type: application/pkcs7-mime; smime-type=signed-data;
    name="smime.p7m"
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
```

Thunderbird ignores the Content-Disposition header and just displays the
contents of that "attachment". KMail 4.14.10, however, displays it as declared
by the sender (as an attachment with name "smime.p7m") and provides no way to
read the content.

I am using Debian 9 / Stretch, with KMail being at version 4:4.14.10-2.

Reproducible: Always

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